As mentioned in the main text, "The lagoon and beach are suitable for kiting about 3 hours either side of low tide and are largely covered during high tide with no place to launch."
It would seem that use of the beach and lagoon are not recommended outside these hours, and doing so could be putting yourself in a position of unnecessary risk.
The article is meant as a guide for recommended use of this spot, when and where you decide to kite is really a personal decision. We must remember that kiting comes with it's own inherent risks and with that in mind a full course of lessons and potentially follow up lessons should be taken.
We must also be aware that beaches are public places and we should really give consideration to the public and all other beach users. Lifeguards too are only in place during the summer months and should not really be relied on for oversight and rescue - if you are unsure of the safety packdown procedures then organise a refresher with a qualified instructor and practice it regularly. Being a strong, confident swimmer is also wise - if you don't feel your swimming will get you back to shore, should the need arise, work on your swimming, wear a personal floation device, and do not kite further than you would be comfortable swimming back.